Boiler-furnace.



W. J. MANHIRE;

BOILiR' FURNACE.

APPLICATION FILED JUNE 2, m1.

1 %9 ,%5 Patented Feb. 11, 191%.

INVENTOR 1RR|S PETERS. INC" Lmlo WASHINGTON r t WILLIAM J. IRE, OF KANSAS CITY, EZSSUUBI, ASSZQETGR are GCJMEUSWGW SPECIALTY C0,, 035 KANfiAS fiETY, MISSQURI, A GQREGBFJEITXGE (9F MISSGURI.

QUEER-FURNACE.

Specification of Letters Patent.

aatented. Feb, Keith,

Application filed June 1, 181?. Serial No. 1.2 2326 out smoke from the stack-except when 1ir ing and for a minute or two thereafter and for producing steam at high pressure in a comparatively short time. I

More specifically my object is to provide for an auxiliary supply of heated air and for the admixture thereof with smoke and gases arising unburned from the fire on the grate, and for the burning of such mixture back of the bridge Wall of the furnace.

Another object is to provide a furnace of that type supplied with air below the grate at a pressure in excess of the pull or draft through the stack, with a constricted passage below and spaced from the boiler, through which most of the burned and unburned gases must pass, and means for. delivering heated air to the combustion chamber adjacent the mouth of said passage so that such air shall travel through the passage and mix therein with the gases in the form of carbon monoxid, and thereby produce a combustible mixture and provide for re-ignition and secondary combustion back of the bridge wall and the consequent substantially uniform application of intense heat to the boiler for the full length thereof.

With these general objects in view the invention consists in certain novel and useful features of construction and combinations of parts, as hereinafter described and claimed; and in order that it may be fully understood reference is to be had to the accompanying drawing, in which:

Figure 1, is a central vertical longitudinal section of a boiler furnace, embodying my invention.

Fig. 2, is a cross section taken on the hue IIII of Fig. l, with the boiler in elevation.

Fig. 3, is a section on the line llli-lll of ldig. 1.

In the said drawing, 1 is a boiler furnace, 2 the boiler therein, 3 the bridge wall, a the grate dividing the space forward of the bridge wall into a lire box 5 and ash pit 6. The grate may be of any approved character, but preferably will be of the type illustrated and described in l atent No. 1,218,199, issued March 6, 1917. A blower, not shown, is adapted to supply air under pressure through a due I to ash pit, it

being preferred said flue shall extend through the bridge wall, as shown. In this connection it is desirable to state that the pressure supplied by the blower is prefer ably in excess of the draft through the stack, not shown, and with a furnace which if consumes practically all smoke, this relation of pressures can be readily established by partial closure of the stack, as it is not desirable from an economical standpoint to supply heavy pressure from the blower,

The furnace as thus far described is not new in a patentable sense; To make pro vision for increasing the efficiency of the furnace and the burning of low-grade fuel and developing the greatest possible heat therefrom and the widest and most uniform application of such heat to the boiler, the bridge wall is formed with a constricted opening or passage 8, the top of the bridge wall being in the form of an arch 9 which is extended rearwardly beyond the brid-gcwall and preferably bends downward its rear end at 10, to a plane'below the plane" of the lower side of the opening or passage at the front end or mouth o smoke as hereinafter explained, s flccted downwardly toward the o the furnace, before passing to "he of the boiler.

11 indicates air ducts extending along Wall, and in this connection it will be un- 7 plane of the grate and establishing commu-' above said wall sufiiciently derstood that through the downward fleet-ion of this burning-mixture, there is a slight period of time when there is no ab sorption of heat ,by the boiler and as a resuit the heat produced at the point mentioned is increased by the more perfect combustion by thetime it comes into' contact with the boiler.

To provide for the distribution of heat upon he boiler vertically above the bridge wall, and yet choke or restrict the space to insure the passage of most of the smoke and gases 'tln'rough the bridge worlt partition 14: provided with a plurality of openings 15, is erected upon the arch.

its the mode of operation of the furnace has beendcscribed in--\conneotion with the detailed reference to the \parts of the furnace, no recapitulatlon of the operation is.

deemed necessary, it being understood of course that the furnace is susceptible ofmodification as regards its form, proportion, and arrangement of parts without departing from the principle and operation in volved or from the spirit and scope of the appended claims.

I claim:

1. A. boiler furnace including a bridge wall, a grate, a firebox and an ash pit in front and a combustion chamber "in the rear of the bridge wall, the bridge wall having an upper extension running rearward into the combustion chamber, and a constricted passp-aced from the boiler and above the nica tion between the fire box and the combustion chamber below the said extension of the bridge wall; the furnace having an air duct for supplying heated air to the conwall passage, brick stricted passage and a controlled 'fiue for supplying air to the ash pit forpassage up through the grate.

2. A boiler furnace including a bridge wall, a perforated partition between the bridge wall and the boiler, a-grate, a fire box and an ash pit in front and a combustion chamber in the rear of the bridge wall, the bridge wall having an upper extension running rearward into the combustion chamber, and a constricted passage spaced from the boiler and above the plane of and establishing communication between the fire box and the combustion chamber below the said extension of the bridge'wall; the furnace having an air duct for supplying heated air to the constricted passage and controlled flue for supplying air to the ash pit for passage up through the grate 3. A boiler furnace including a bridge wall, a grate, a fire box and an ash pit in front and a combustion chamber in the rear of the bridge wall, the bridge wall having an upper extension running rearward into the combustion chamber, and a constricted passage spaced from the boiler and above the plane of the grate and establishing communication between the fire box and the combustion chamber below the said extension of the bridge wall; the furnace having an air duct having branch ducts communicating with the fire box above the rear end of, the grate for supplying heated air to the constricted passage and a controlled flue for supplying air to the ash pit for passage up through the grate. I

In testimony whereof, I affix my signature, 80 in the presence of two witnesses.

rLLiAM J. MANHIRE.

Witnesses K. M, THORPE, G. Y. THQBPE.

the grate 

